If I were to replace a 37820-P28-A02 with another 37820-P28-A02 ECM, would I need to have it "reprogrammed" or can I continue on?

 

Continue on.

 

My current issue that seems to boil down to the ECM is this. I am getting no signal pulsing to my #3 injector. It has the 12v signal, but evidently not the pulsing ground. If I swap the leads with the #4 injector, the #3 injector works fine, so it is not an injector problem. I have tested continuity back to the C101/C206 connector and it is fine. There is a chance that the wire is broken between there and the ECM, but I doubt it. I also suspect the ECM because besides the #3 injector issue the engine stutters violently (read whaaka, whaaka, whaaka) at 3,500 rpm, regardless of speed, gear, etc. It also used to stutter occasionally in first gear prior to the injector issue.
So, my new question is this. While I wait for a new ECM can I cross-connect the #3 and #4 injector wires so my engine doesn't miss so badly (I need to drive it to work and back daily)? I was amazed that while doing my little injector test it ran well (obviously still only on three cylinders) with the #4 wire going to the #3 injector! As near as I can tell, #3 is on the compression stroke while #4 is on its intake stroke. I feel injecting into #3 during the compression stroke would not be all that bad of a thing. It would just make it into a bit of a two-stroke cylinder vs four-stroke.
Any thoughts on this?

 

Connecting two injectors in parallel would overload the injector driver, it is designed and calibrated to drive only one. Running on 3 cylinders is going to shake stuff to death, park the car until you make proper repairs.

 

This may be part of the problem, if not all.

 

Looks like rodent damage.

 

Yes, rodents.

I think you can unplug the plugs under the hood then pull the harness through the firewall to the inside of the car making it easier to reach the damaged area. Splice the wires and tape it up.

 

I repaired this damage and the car runs like new now! I was minutes away from ordering a new ECM, too. I also found 16 partially chewed nuts under the battery tray adjacent to the wires.

 

Dese nutz...

 

yea it was never the ecu good job fixing it thou